The Instagram icon uses a gradient that runs from yellow and orange to pink, purple and violet blue. Inside is a simple white camera. Since it is a gradient, there is no single brand color; these are the most cited color stops. The HEX codes are commonly used values, not published as an official specification.
These are commonly used reference values; they can vary by source, material or screen. Brand names and colors belong to their owners; this page only lists color codes for information.